Matthew Poole and continuators on 1 Kings 11:4

4 For it came to pass, when Solomon was old , that his wives turned away his heart after other gods : and his heart was not perfect with the LORD his God, as was the heart of David his father.

As having now Reigned nigh 30 Years, when it might have been expected that Age should have cooled his Lust, and experience have made him wiser and better, and when probably he was secure as to any such miscarriages: Then God permitted him to fall so shamefully, that he might be to all succeeding Generations an example of Gods severity, and of the folly, and weakness, and wickedness of the wisest and best men, when left to themselves.

Not that they changed his mind or opinion about the True God, and Idols, which is not credible; but that they cooled his zeal against them, obtained from him a publick indulgence for their worship, and money for the making of Idols, and the support of the charges of their Priests and Sacrifices, and possibly persuaded him sometimes in complaisance to joyn with them in the outward act of Idol-worship; or, at least, in their Feasts upon their Sacrifices, which was a participation of their Idolatry. See Psal. 106. 28. 1 Cor. 10. 20.

Marginal references: Chap. 15. 3.